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What's the best way to shade a greenhouse?

Finally the sun is now on my greenhouse but I'm worried about my seedlings as the temp is reading 30C. I bought some clips specially designed for aluminium greenhouses to hold shading/bubble wrap/plant ties but they're slightly too big for the groove. I foolishly thought they would be a standard fit but life's never that straightforward! Any suggestions? Many thanks.



  • Try using some foam sheets (or shapes) that you can buy for crafts, cut some pieces from it to fit in the space between the clips you bought, don't know if it would work but worth a try image It doesn't cost much to buy so if it didn't work I'm sure some children would make good use of it image

  • JulieS2JulieS2 Posts: 18

    Thanks for your suggestion Pauline, but the clips are too big for the groove, not the other way round and so when I try to twist them into the groove they split. Maybe I'll have to use paint?image

  • PalaisglidePalaisglide Posts: 3,414

    Julie, Do not use paint you will regret it, open the door and any vents and a couple of buckets of water on the floor will help cool it.
    My greenhouse is South facing so I fitted extra vents, they can be manual or automatic at the ends so door open one end vents open the other a cooling draught wafts through.
    I also use a cooling fan on hot days if ever we get any and individual plants can have a bit of green mesh hung over or around them.
    The plants need the sun just as we do so shading the whole greenhouse defeats the object. If we have a heat wave lift your trays outside into a sheltered place during the day and put them back at night.
    I have a bench outside in a nice sunny sheltered spot and put the trays on that during the hot part of the day, and yes I do vaguely remember hot parts of the day, once upon a time.


  • PalustrisPalustris Posts: 3,953

    Best place for shading is on the outside of the glass, that way it stops the inside from heating up. We use green shade natting draped over the ridges. But the best way of all, is to put wooden sltas over the roof, expensive though.

  • Alan4711Alan4711 LincolnshirePosts: 1,657
    crikey Frank youv got a good memory
  • JulieS2JulieS2 Posts: 18

    Thanks Palaisglide and Berghill - I'm glad you said no to the paint I didn't like the idea as plants seem to thrive in the sun unless it's too hot.

    Yesterday I managed to find some metal fixings that work and today I'm going to try and put up netting in such a way that I can fold it back for the early morning sun (as I sit here looking out at a miserable grey day) 

  • PalaisglidePalaisglide Posts: 3,414

    JulieS2, exactly, and why I never shade the greenhouse these days it is a waste of time and money. Being retired I am always about so "if and when" we get a scorching day I can simply open every vent wet the flags and gravel then drape some net or even put a couple of loose plywood boards in position to shade the plants and having a fan I put it on fast blow. Never had scorch on plants and tomato's love the sun, I keep them what I call finger damp not soaking, dip a finger in if it comes out with a bit of soil stuck to it well and good if it comes out muddy not good and if it comes out clean as it went in well very not good. Bottomless pots on gravel I find best, you water the gravel and every couple of weeks top up the pot with more compost. When everyone around me lost their tomato's to blight mine were OK.
    All this is from my own experience over many years others do things in a different way, there are no right or wrong ways it is what suits you and the way you garden, when I was working all day I did things in a different way.


  • JulieS2JulieS2 Posts: 18

    Thanks Frank there's nothing like real practical advice from many years of experience. I used your 'finger damp' tip today. I'll be relying on your advice again!


  • PalaisglidePalaisglide Posts: 3,414

    Julie, you are welcome, that is why we post on this site to pass on our knowledge usually gained by making big mistakes.
    I was lucky in that my Father was a very keen gardener so it was drummed into me from an early age, then of course we often get castigated for being old fashioned by some, it worries me not.
    Every few years we old timers come into our own such as now people are throwing out decking and patio's to plant up vegetable gardens, the need to eat cuts through all the modern fads.


  • SuziepoSuziepo Posts: 10

    I know the winter is here now, but last summer I was recording temperatures up to 52C in my greenhouse, Death Valley!. It's a new greenhouse with auto vents and I do leave the door open and damp down but it doesn't seem to really lower the temperature. Any other shading from the inside ideas guys? It is a Hartley greenhouse if that helps. I shall be growing cacti next year is so.


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